Connection for connecting piston rods to main rods of engines



Aug. 25, 1931. H. M. TOWER 1,820,6 38

CONNECTION FOR CONNECTING PISTON RODS TO MAIN RODS OF ENGINES Filed Dec. 23, 1926 2 Sheets-Sheet 1 I 'INVENT R I i ESSES &/ 'Ww 474% Aug. 25, 1931. H. M. TOWER 1,820,638

CONNECTION FOR CONNECTING PISTON RODS TO MAIN RODS OF ENGINES Filed Dec. 23, 1926 2 Sheets-Sheet 2 196 FIG.7 70 199, 8g

,, lNVE T R Patented Aug. 25, 1931 UNITED STATES HENRY MORTIMER TOWER, OF HASTINGS-ON-HUDSON, NEW YORK CONNECTION FOR CONNECTING PISTON RODS TO MAIN RODS OF ENGINES Application filed December 23, 1926. Serial No. 156,627.

My invention more particularly relates to means for holding a wrist pin securely in place in a cross head, and retracting it therefrom.

I am aware that it is old to provide'a cross head with a boss surrounding the wrist pin bore, the boss having a vertical slot through its top and bottom walls; and to use a wrist pin having a cross axial slot of shorter length than the boss slots, and registering therewith. A gib and a key, fitted in the slots, are adapted, when assembled in one .way, to hold the wrist pin in place, and, when assembled in a reversed way, to enable easy retraction of the pin by blows of a hammer on the key. The gib is formed at each end with a heel adapted to bear on the end walls of the slot, the portion intermediate the heels being spaced from the ends of the slot in the wrist pin. The'gib is formed, atjts top end, with an extension, adapted to assist in aligning the gib in position, and, at its bottom end, with a bolt hole, through which passes a retaining bolt.

An object of the present invention is to provide a combined wrist pin holder and extractor, which can be inexpensively manufactured, which comprises fewer parts, which-requires less metal, which is lighter in weight, which is more durable, and which is more eflicient in operation than the wrist pin holders heretofore known.

The improvement claimed is hereinafter fully set forth.

In the accompanying drawings: Figure 1, is a side view, in elevation, of a cross head embodying my invention; Fig. 2, a view,

in perspective, of the wrist pin; Figs. 3, 4, and 5, views, in perspective, of the gib, the key, and the flanged washer, respectively; Fig. 6, a transverse section, taken on the line, a a, of Fig. 1, showing the parts in pin-holding position; and, Fig. 7 a similar section, showing the parts in pin-retracting position.

type, having a; front vertical wall, 10, and

a rear vertical wall, 11, each provided with atapered bore for the reception of the wrist pin. The wrist pin comprises a. cylindrical portion, 12, adapted to fit into the bearing at one end of the driving rod; and two frustoconical portions, 13 and 14, which fit in the tapered bores in'the walls of the cross head.

A portion, 15, of the wrist pin, extends a considerable distance beyond the front wall 3 of the cross head, and is provided with a cross axial slot, 16, for the gib and the key. The front wall of the cross head is pro vided with a boss, 17, adapted to receive the slotted portion, 15, of the wrist pin.

The gib, 18, is formed with an inclined face, on which the oppositely inclined face of the key, 19, bears, and a tongue, 18a, adapted to bear on the end walls of the wrist pin slot, 16. The upper end of the gib, 18, is formed with a head, 18b, of greater width than the boss slot, which head serves to align the gib properly in the slots. The key, 19, is of usual type, having a straight face, 19a, adapted to bear on the end walls of the boss slots; and a threaded lower end portion, 195, onwhich are fitted, a flanged washer, 20, and retaining nuts, 21. The boss, 17, on the cross head, is formed with aligned slots, 22,iin its top and bottom walls. The slots, 22, are shorter than the wrist pin slot, 16, which construction effects a substantial reduction in the weight of the pin, and a material saving of metal.

Referring to Fig. 6, in which the parts are .shown in holding position, it will be' noted that the key bears on the outer end walls of the boss slots, and that the tongue, 18a, of the gib, bears on the inner end wall of the wrist pin slot. Suflicient clearance exists between the outer end wall of the wrist pin slot and the key to permit the necessary movement of the wrist pin.

Referring to Fig. 7, where the parts are shown in retracting position, it will be noted that the positions of the gilo and the key are reversed, the tongue, 18a, bearing on the outer end wall of the wrist pin slot, and the key bearing on the inner end walls of the boss slots.

The improved construction possesses the following important advantages over the art. viz: it comprises fewer parts; it effects a material saving in weight and metal; it

can be manufactured without the necessity for precision in the length of the boss and Wrist pan slots; and it can be operated with a minimum of labor.

I claim as my invention and desire to secure by Letters Patent:

1. A gib comprising a shank, a lug disposed intermediate the length of the shank and projecting transversely thereof, and a head united to the shank and projecting therefrom transversely of the lug.

' 2-. In a device for use in engines, the combination of a cross-head having a laterally projecting boss provided with a wrist pin bore and two registering slots, said slots being disposed longitudinally and on diametrically opposite sides of the bore; a wrist pin having a portion extending into the bore, said portion having a cross axial slot in register with the boss slots, and extending beyond the opposite ends of the boss slots; a gib comprising a portion disposed in one of the boss slots and spaced from the inner end Wall thereof, and a portion titted in the wrist pin slot and bearing on the inner end wall thereof; a key fitted in one of the boss slots and the wrist pin slot and having one face bearing for part of its length on the outer end of the boss slot and spaced for part of its length from the outer end of the Wrist pin slot, said key being adapted to coact with the cross-head boss and gib to hold the wrist pin in place in the cross-head; and means disposed on one end of said key to secure said key in adjusted position in said slots.

3. In a device for use in engines, the combination of a cross-head having a laterally projecting boss provided with a wrist pin bore and two registering slots, said slots being disposed longitudinally and on diametrically opposite sides of the bore; a wrist pin having a portion extending into the bore, said portion having a cross axial slot in 1eg ister with the boss slots, and extending beyond the opposite ends of the boss slots; a gib comprising a portion disposed in one of the boss slots and spaced from the inner end wall thereof, and a portion fitted in the wvrist pin slot and bearing on the inner end Wall thereof; a tapered key fitted in one HENRY MORTIMER TOWER. 

